There's a small copy / paste gone wrong issue in the code: mpz_powm_ui(out,
x, -1UL, n). Unfortunately, even after I remove the UL, the behavior is the
same.
Mihai
On Sunday, June 24, 2012 10:47:36 PM UTC+2, michael85 wrote:
>
> Hello Everyone,
>
> For some reason, I am not able to understand why the following code prints
> different results:
>
> mpz_t x, n, out;
>
> mpz_init_set_ui(x, 2UL);
> mpz_init_set_ui(n, 7UL);
> mpz_init(out);
>
> mpz_invert(out, x, n);
> gmp_printf ("%Zd\n", out);//prints 4. 2 * 4 (mod 7) = 1. OK
>
> mpz_powm_ui(out, x, -1UL, n);//prints 1. 2 * 1 (mod 7) = 2. How come?
> gmp_printf ("%Zd\n", out);
>
> mpz_clear(x);
> mpz_clear(n);
> mpz_clear(out);
>
> The documentation states that negative exponents are supported by mpz_powm
> if base^-1 nod n exists. This behavior is the same as in GMP 4.1 on
> Windows. What am I missing here?
>
> Best regards,
> Mihai Todor
>
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